text: import React, { Component } from 'react';
  
  import Span from './Span';
  
  export default class ScalarInput extends Component {
    render() {
      const classes = 'scalarInput p-1';
  
      let placeholder = this.props.placeholder || '0';
      return (
        <Span type='number' className={classes} placeholder={placeholder}/>
      )
    }
  }
  